2 Unix SMB/CIFS implementation.
4 trivial database library
6 Copyright (C) Andrew Tridgell 1999-2005
7 Copyright (C) Paul `Rusty' Russell 2000
8 Copyright (C) Jeremy Allison 2000-2003
10 ** NOTE! The following LGPL license applies to the tdb
11 ** library. This does NOT imply that all of Samba is released
14 This library is free software; you can redistribute it and/or
15 modify it under the terms of the GNU Lesser General Public
16 License as published by the Free Software Foundation; either
17 version 3 of the License, or (at your option) any later version.
19 This library is distributed in the hope that it will be useful,
20 but WITHOUT ANY WARRANTY; without even the implied warranty of
21 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
22 Lesser General Public License for more details.
24 You should have received a copy of the GNU Lesser General Public
25 License along with this library; if not, see <http://www.gnu.org/licenses/>.
30 static int fcntl_lock(struct tdb_context *tdb,
31 int rw, off_t off, off_t len, bool waitflag)
36 fl.l_whence = SEEK_SET;
42 return fcntl(tdb->fd, F_SETLKW, &fl);
44 return fcntl(tdb->fd, F_SETLK, &fl);
47 static int fcntl_unlock(struct tdb_context *tdb, int rw, off_t off, off_t len)
50 #if 0 /* Check they matched up locks and unlocks correctly. */
55 locks = fopen("/proc/locks", "r");
57 while (fgets(line, 80, locks)) {
61 /* eg. 1: FLOCK ADVISORY WRITE 2440 08:01:2180826 0 EOF */
62 p = strchr(line, ':') + 1;
63 if (strncmp(p, " POSIX ADVISORY ", strlen(" POSIX ADVISORY ")))
65 p += strlen(" FLOCK ADVISORY ");
66 if (strncmp(p, "READ ", strlen("READ ")) == 0)
68 else if (strncmp(p, "WRITE ", strlen("WRITE ")) == 0)
73 if (atoi(p) != getpid())
75 p = strchr(strchr(p, ' ') + 1, ' ') + 1;
77 p = strchr(p, ' ') + 1;
78 if (strncmp(p, "EOF", 3) == 0)
81 l = atoi(p) - start + 1;
85 fprintf(stderr, "Len %u should be %u: %s",
90 fprintf(stderr, "Type %s wrong: %s",
91 rw == F_RDLCK ? "READ" : "WRITE", line);
100 fprintf(stderr, "Unlock on %u@%u not found!\n",
109 fl.l_whence = SEEK_SET;
114 return fcntl(tdb->fd, F_SETLKW, &fl);
117 /* a byte range locking function - return 0 on success
118 this functions locks/unlocks 1 byte at the specified offset.
120 note that a len of zero means lock to end of file
122 static int tdb_brlock(struct tdb_context *tdb,
123 int rw_type, tdb_off_t offset, tdb_off_t len,
124 enum tdb_lock_flags flags)
128 if (tdb->flags & TDB_NOLOCK) {
132 if (rw_type == F_WRLCK && tdb->read_only) {
133 tdb->ecode = TDB_ERR_RDONLY;
137 /* A 32 bit system cannot open a 64-bit file, but it could have
138 * expanded since then: check here. */
139 if ((size_t)(offset + len) != offset + len) {
140 tdb->ecode = TDB_ERR_IO;
141 tdb->log(tdb, TDB_DEBUG_ERROR, tdb->log_priv,
142 "tdb_brlock: lock on giant offset %llu\n",
143 (long long)(offset + len));
148 ret = fcntl_lock(tdb, rw_type, offset, len,
149 flags & TDB_LOCK_WAIT);
150 } while (ret == -1 && errno == EINTR);
153 tdb->ecode = TDB_ERR_LOCK;
154 /* Generic lock error. errno set by fcntl.
155 * EAGAIN is an expected return from non-blocking
157 if (!(flags & TDB_LOCK_PROBE) && errno != EAGAIN) {
158 tdb->log(tdb, TDB_DEBUG_ERROR, tdb->log_priv,
159 "tdb_brlock failed (fd=%d) at"
160 " offset %llu rw_type=%d flags=%d len=%llu\n",
161 tdb->fd, (long long)offset, rw_type,
162 flags, (long long)len);
169 static int tdb_brunlock(struct tdb_context *tdb,
170 int rw_type, tdb_off_t offset, size_t len)
174 if (tdb->flags & TDB_NOLOCK) {
179 ret = fcntl_unlock(tdb, rw_type, offset, len);
180 } while (ret == -1 && errno == EINTR);
183 tdb->log(tdb, TDB_DEBUG_TRACE, tdb->log_priv,
184 "tdb_brunlock failed (fd=%d) at offset %llu"
185 " rw_type=%d len=%llu\n",
186 tdb->fd, (long long)offset, rw_type, (long long)len);
193 upgrade a read lock to a write lock. This needs to be handled in a
194 special way as some OSes (such as solaris) have too conservative
195 deadlock detection and claim a deadlock when progress can be
196 made. For those OSes we may loop for a while.
198 int tdb_allrecord_upgrade(struct tdb_context *tdb)
202 if (tdb->allrecord_lock.count != 1) {
203 tdb->log(tdb, TDB_DEBUG_ERROR, tdb->log_priv,
204 "tdb_allrecord_upgrade failed: count %u too high\n",
205 tdb->allrecord_lock.count);
209 if (tdb->allrecord_lock.off != 1) {
210 tdb->log(tdb, TDB_DEBUG_ERROR, tdb->log_priv,
211 "tdb_allrecord_upgrade failed: already upgraded?\n");
217 if (tdb_brlock(tdb, F_WRLCK,
219 + (1ULL << tdb->header.v.hash_bits), 0,
220 TDB_LOCK_WAIT|TDB_LOCK_PROBE) == 0) {
221 tdb->allrecord_lock.ltype = F_WRLCK;
222 tdb->allrecord_lock.off = 0;
225 if (errno != EDEADLK) {
228 /* sleep for as short a time as we can - more portable than usleep() */
231 select(0, NULL, NULL, NULL, &tv);
233 tdb->log(tdb, TDB_DEBUG_WARNING, tdb->log_priv,
234 "tdb_allrecord_upgrade failed\n");
239 static struct tdb_lock_type *find_nestlock(struct tdb_context *tdb,
244 for (i=0; i<tdb->num_lockrecs; i++) {
245 if (tdb->lockrecs[i].off == offset) {
246 return &tdb->lockrecs[i];
252 /* lock an offset in the database. */
253 static int tdb_nest_lock(struct tdb_context *tdb, tdb_off_t offset, int ltype,
254 enum tdb_lock_flags flags)
256 struct tdb_lock_type *new_lck;
258 /* Header is not valid for open lock; valgrind complains. */
259 if (offset >= TDB_HASH_LOCK_START) {
260 if (offset > TDB_HASH_LOCK_START
261 + (1ULL << tdb->header.v.hash_bits)
262 + (tdb->header.v.num_zones
263 * (tdb->header.v.free_buckets+1))) {
264 tdb->ecode = TDB_ERR_LOCK;
265 tdb->log(tdb, TDB_DEBUG_FATAL, tdb->log_priv,
266 "tdb_lock: invalid offset %llu ltype=%d\n",
267 (long long)offset, ltype);
271 if (tdb->flags & TDB_NOLOCK)
274 new_lck = find_nestlock(tdb, offset);
277 * Just increment the in-memory struct, posix locks
284 new_lck = (struct tdb_lock_type *)realloc(
286 sizeof(*tdb->lockrecs) * (tdb->num_lockrecs+1));
287 if (new_lck == NULL) {
288 tdb->ecode = TDB_ERR_OOM;
289 tdb->log(tdb, TDB_DEBUG_ERROR, tdb->log_priv,
290 "tdb_lock: unable to allocate %llu lock structure",
291 (long long)(tdb->num_lockrecs + 1));
295 tdb->lockrecs = new_lck;
297 /* Since fcntl locks don't nest, we do a lock for the first one,
298 and simply bump the count for future ones */
299 if (tdb_brlock(tdb, ltype, offset, 1, flags)) {
303 tdb->lockrecs[tdb->num_lockrecs].off = offset;
304 tdb->lockrecs[tdb->num_lockrecs].count = 1;
305 tdb->lockrecs[tdb->num_lockrecs].ltype = ltype;
311 static int tdb_lock_and_recover(struct tdb_context *tdb)
317 /* We need to match locking order in transaction commit. */
318 if (tdb_brlock(tdb, F_WRLCK, FREELIST_TOP, 0, TDB_LOCK_WAIT)) {
322 if (tdb_brlock(tdb, F_WRLCK, OPEN_LOCK, 1, TDB_LOCK_WAIT)) {
323 tdb_brunlock(tdb, F_WRLCK, FREELIST_TOP, 0);
327 ret = tdb_transaction_recover(tdb);
329 tdb_brunlock(tdb, F_WRLCK, OPEN_LOCK, 1);
330 tdb_brunlock(tdb, F_WRLCK, FREELIST_TOP, 0);
339 static bool tdb_needs_recovery(struct tdb_context *tdb)
345 static int tdb_nest_unlock(struct tdb_context *tdb, tdb_off_t off, int ltype)
348 struct tdb_lock_type *lck;
350 if (tdb->flags & TDB_NOLOCK)
353 lck = find_nestlock(tdb, off);
354 if ((lck == NULL) || (lck->count == 0)) {
355 tdb->ecode = TDB_ERR_LOCK;
356 tdb->log(tdb, TDB_DEBUG_ERROR, tdb->log_priv,
357 "tdb_unlock: no lock for %llu\n", (long long)off);
361 if (lck->count > 1) {
367 * This lock has count==1 left, so we need to unlock it in the
368 * kernel. We don't bother with decrementing the in-memory array
369 * element, we're about to overwrite it with the last array element
372 ret = tdb_brunlock(tdb, ltype, off, 1);
375 * Shrink the array by overwriting the element just unlocked with the
376 * last array element.
378 *lck = tdb->lockrecs[--tdb->num_lockrecs];
380 if (tdb->num_lockrecs == 0) {
381 /* If we're not holding any locks, header can change. */
382 tdb->header_uptodate = false;
390 get the transaction lock
392 int tdb_transaction_lock(struct tdb_context *tdb, int ltype,
393 enum tdb_lock_flags lockflags)
395 return tdb_nest_lock(tdb, TRANSACTION_LOCK, ltype, lockflags);
399 release the transaction lock
401 int tdb_transaction_unlock(struct tdb_context *tdb, int ltype)
403 return tdb_nest_unlock(tdb, TRANSACTION_LOCK, ltype, false);
407 /* We only need to lock individual bytes, but Linux merges consecutive locks
408 * so we lock in contiguous ranges. */
409 static int tdb_lock_gradual(struct tdb_context *tdb,
410 int ltype, enum tdb_lock_flags flags,
411 tdb_off_t off, tdb_off_t len)
414 enum tdb_lock_flags nb_flags = (flags & ~TDB_LOCK_WAIT);
417 /* Single record. Just do blocking lock. */
418 return tdb_brlock(tdb, ltype, off, len, flags);
421 /* First we try non-blocking. */
422 ret = tdb_brlock(tdb, ltype, off, len, nb_flags);
427 /* Try locking first half, then second. */
428 ret = tdb_lock_gradual(tdb, ltype, flags, off, len / 2);
432 ret = tdb_lock_gradual(tdb, ltype, flags,
433 off + len / 2, len - len / 2);
435 tdb_brunlock(tdb, ltype, off, len / 2);
441 /* lock/unlock entire database. It can only be upgradable if you have some
442 * other way of guaranteeing exclusivity (ie. transaction write lock).
443 * Note that we don't lock the free chains: noone can get those locks
444 * without a hash chain lock first.
445 * The header *will be* up to date once this returns success. */
446 int tdb_allrecord_lock(struct tdb_context *tdb, int ltype,
447 enum tdb_lock_flags flags, bool upgradable)
451 /* FIXME: There are no locks on read-only dbs */
452 if (tdb->read_only) {
453 tdb->ecode = TDB_ERR_LOCK;
454 tdb->log(tdb, TDB_DEBUG_ERROR, tdb->log_priv,
455 "tdb_allrecord_lock: read-only\n");
459 if (tdb->allrecord_lock.count && tdb->allrecord_lock.ltype == ltype) {
460 tdb->allrecord_lock.count++;
464 if (tdb->allrecord_lock.count) {
465 /* a global lock of a different type exists */
466 tdb->ecode = TDB_ERR_LOCK;
467 tdb->log(tdb, TDB_DEBUG_ERROR, tdb->log_priv,
468 "tdb_allrecord_lock: already have %s lock\n",
469 tdb->allrecord_lock.ltype == F_RDLCK
474 if (tdb_has_locks(tdb)) {
475 /* can't combine global and chain locks */
476 tdb->ecode = TDB_ERR_LOCK;
477 tdb->log(tdb, TDB_DEBUG_ERROR, tdb->log_priv,
478 "tdb_allrecord_lock: already have chain lock\n");
482 if (upgradable && ltype != F_RDLCK) {
483 /* tdb error: you can't upgrade a write lock! */
484 tdb->ecode = TDB_ERR_LOCK;
485 tdb->log(tdb, TDB_DEBUG_ERROR, tdb->log_priv,
486 "tdb_allrecord_lock: can't upgrade a write lock\n");
490 /* Lock all the hash buckets. */
492 hash_size = (1ULL << tdb->header.v.hash_bits);
493 if (tdb_lock_gradual(tdb, ltype, flags, TDB_HASH_LOCK_START,
495 if (!(flags & TDB_LOCK_PROBE)) {
496 tdb->log(tdb, TDB_DEBUG_ERROR, tdb->log_priv,
497 "tdb_lockall hashes failed (%s)\n",
503 tdb->allrecord_lock.count = 1;
504 /* If it's upgradable, it's actually exclusive so we can treat
505 * it as a write lock. */
506 tdb->allrecord_lock.ltype = upgradable ? F_WRLCK : ltype;
507 tdb->allrecord_lock.off = upgradable;
509 /* Now we re-check header, holding lock. */
510 if (unlikely(header_changed(tdb))) {
511 tdb_allrecord_unlock(tdb, ltype);
515 /* Now check for needing recovery. */
516 if (unlikely(tdb_needs_recovery(tdb))) {
517 tdb_allrecord_unlock(tdb, ltype);
518 if (tdb_lock_and_recover(tdb) == -1) {
527 int tdb_lock_open(struct tdb_context *tdb)
529 return tdb_nest_lock(tdb, TDB_OPEN_LOCK, F_WRLCK, TDB_LOCK_WAIT);
532 void tdb_unlock_open(struct tdb_context *tdb)
534 tdb_nest_unlock(tdb, TDB_OPEN_LOCK, F_WRLCK);
537 /* unlock entire db */
538 int tdb_allrecord_unlock(struct tdb_context *tdb, int ltype)
542 /* FIXME: There are no locks on read-only dbs */
543 if (tdb->read_only) {
544 tdb->ecode = TDB_ERR_LOCK;
545 tdb->log(tdb, TDB_DEBUG_ERROR, tdb->log_priv,
546 "tdb_allrecord_unlock: read-only\n");
550 if (tdb->allrecord_lock.count == 0) {
551 tdb->ecode = TDB_ERR_LOCK;
552 tdb->log(tdb, TDB_DEBUG_ERROR, tdb->log_priv,
553 "tdb_allrecord_unlock: not locked!\n");
557 /* Upgradable locks are marked as write locks. */
558 if (tdb->allrecord_lock.ltype != ltype
559 && (!tdb->allrecord_lock.off || ltype != F_RDLCK)) {
560 tdb->ecode = TDB_ERR_LOCK;
561 tdb->log(tdb, TDB_DEBUG_ERROR, tdb->log_priv,
562 "tdb_allrecord_unlock: have %s lock\n",
563 tdb->allrecord_lock.ltype == F_RDLCK
568 if (tdb->allrecord_lock.count > 1) {
569 tdb->allrecord_lock.count--;
573 tdb->allrecord_lock.count = 0;
574 tdb->allrecord_lock.ltype = 0;
575 tdb->header_uptodate = false;
577 hash_size = (1ULL << tdb->header.v.hash_bits);
579 return tdb_brunlock(tdb, ltype, TDB_HASH_LOCK_START, hash_size);
582 bool tdb_has_locks(struct tdb_context *tdb)
584 return tdb->allrecord_lock.count || tdb->num_lockrecs;
588 /* lock entire database with write lock */
589 int tdb_lockall(struct tdb_context *tdb)
591 tdb_trace(tdb, "tdb_lockall");
592 return tdb_allrecord_lock(tdb, F_WRLCK, TDB_LOCK_WAIT, false);
595 /* lock entire database with write lock - nonblocking varient */
596 int tdb_lockall_nonblock(struct tdb_context *tdb)
598 int ret = tdb_allrecord_lock(tdb, F_WRLCK, TDB_LOCK_NOWAIT, false);
599 tdb_trace_ret(tdb, "tdb_lockall_nonblock", ret);
603 /* unlock entire database with write lock */
604 int tdb_unlockall(struct tdb_context *tdb)
606 tdb_trace(tdb, "tdb_unlockall");
607 return tdb_allrecord_unlock(tdb, F_WRLCK);
610 /* lock entire database with read lock */
611 int tdb_lockall_read(struct tdb_context *tdb)
613 tdb_trace(tdb, "tdb_lockall_read");
614 return tdb_allrecord_lock(tdb, F_RDLCK, TDB_LOCK_WAIT, false);
617 /* lock entire database with read lock - nonblock varient */
618 int tdb_lockall_read_nonblock(struct tdb_context *tdb)
620 int ret = tdb_allrecord_lock(tdb, F_RDLCK, TDB_LOCK_NOWAIT, false);
621 tdb_trace_ret(tdb, "tdb_lockall_read_nonblock", ret);
625 /* unlock entire database with read lock */
626 int tdb_unlockall_read(struct tdb_context *tdb)
628 tdb_trace(tdb, "tdb_unlockall_read");
629 return tdb_allrecord_unlock(tdb, F_RDLCK);
633 /* Returns the list we actually locked. */
634 tdb_off_t tdb_lock_list(struct tdb_context *tdb, uint64_t hash,
635 int ltype, enum tdb_lock_flags waitflag)
637 tdb_off_t list = hash & ((1ULL << tdb->header.v.hash_bits) - 1);
638 /* Header can change ONLY if we had no locks before. */
639 bool can_change = tdb->num_lockrecs == 0;
641 /* a allrecord lock allows us to avoid per chain locks */
642 if (tdb->allrecord_lock.count &&
643 (ltype == tdb->allrecord_lock.ltype || ltype == F_RDLCK)) {
647 if (tdb->allrecord_lock.count) {
648 tdb->ecode = TDB_ERR_LOCK;
649 tdb->log(tdb, TDB_DEBUG_ERROR, tdb->log_priv,
650 "tdb_lock_list: have %s allrecordlock\n",
651 tdb->allrecord_lock.ltype == F_RDLCK
657 if (tdb_nest_lock(tdb, TDB_HASH_LOCK_START + list, ltype, waitflag))
660 if (can_change && unlikely(header_changed(tdb))) {
661 tdb_off_t new = hash & ((1ULL << tdb->header.v.hash_bits) - 1);
663 tdb_nest_unlock(tdb, TDB_HASH_LOCK_START+list, ltype);
671 int tdb_unlock_list(struct tdb_context *tdb, tdb_off_t list, int ltype)
673 list &= ((1ULL << tdb->header.v.hash_bits) - 1);
675 /* a allrecord lock allows us to avoid per chain locks */
676 if (tdb->allrecord_lock.count) {
677 if (tdb->allrecord_lock.ltype == F_RDLCK
678 && ltype == F_WRLCK) {
679 tdb->ecode = TDB_ERR_LOCK;
680 tdb->log(tdb, TDB_DEBUG_FATAL, tdb->log_priv,
681 "tdb_unlock_list RO allrecord!\n");
686 return tdb_nest_unlock(tdb, TDB_HASH_LOCK_START + list, ltype);
690 /* Free list locks come after hash locks */
691 int tdb_lock_free_list(struct tdb_context *tdb, tdb_off_t flist,
692 enum tdb_lock_flags waitflag)
694 /* You're supposed to have a hash lock first! */
695 if (!(tdb->flags & TDB_NOLOCK) && !tdb_has_locks(tdb)) {
696 tdb->ecode = TDB_ERR_LOCK;
697 tdb->log(tdb, TDB_DEBUG_FATAL, tdb->log_priv,
698 "tdb_lock_free_list without lock!\n");
702 /* a allrecord lock allows us to avoid per chain locks */
703 if (tdb->allrecord_lock.count) {
704 if (tdb->allrecord_lock.ltype == F_WRLCK)
706 tdb->ecode = TDB_ERR_LOCK;
707 tdb->log(tdb, TDB_DEBUG_FATAL, tdb->log_priv,
708 "tdb_lock_free_list with RO allrecordlock!\n");
712 return tdb_nest_lock(tdb, TDB_HASH_LOCK_START
713 + (1ULL << tdb->header.v.hash_bits)
714 + flist, F_WRLCK, waitflag);
717 void tdb_unlock_free_list(struct tdb_context *tdb, tdb_off_t flist)
719 if (tdb->allrecord_lock.count)
722 tdb_nest_unlock(tdb, TDB_HASH_LOCK_START
723 + (1ULL << tdb->header.v.hash_bits)
727 /* Even if the entry isn't in this hash bucket, you'd have to lock this
728 * bucket to find it. */
729 static int chainlock(struct tdb_context *tdb, const TDB_DATA *key,
730 int ltype, enum tdb_lock_flags waitflag,
734 uint64_t h = tdb_hash(tdb, key->dptr, key->dsize);
736 ret = tdb_lock_list(tdb, h, ltype, waitflag) == TDB_OFF_ERR ? -1 : 0;
737 tdb_trace_1rec(tdb, func, *key);
741 /* lock/unlock one hash chain. This is meant to be used to reduce
742 contention - it cannot guarantee how many records will be locked */
743 int tdb_chainlock(struct tdb_context *tdb, TDB_DATA key)
745 return chainlock(tdb, &key, F_WRLCK, TDB_LOCK_WAIT, "tdb_chainlock");
748 int tdb_chainunlock(struct tdb_context *tdb, TDB_DATA key)
750 uint64_t h = tdb_hash(tdb, key.dptr, key.dsize);
751 tdb_trace_1rec(tdb, "tdb_chainunlock", key);
752 return tdb_unlock_list(tdb, h, F_WRLCK);
756 /* lock/unlock one hash chain, non-blocking. This is meant to be used
757 to reduce contention - it cannot guarantee how many records will be
759 int tdb_chainlock_nonblock(struct tdb_context *tdb, TDB_DATA key)
761 return chainlock(tdb, &key, F_WRLCK, TDB_LOCK_NOWAIT,
762 "tdb_chainlock_nonblock");
765 int tdb_chainlock_read(struct tdb_context *tdb, TDB_DATA key)
767 return chainlock(tdb, &key, F_RDLCK, TDB_LOCK_WAIT,
768 "tdb_chainlock_read");
771 int tdb_chainunlock_read(struct tdb_context *tdb, TDB_DATA key)
773 uint64_t h = tdb_hash(tdb, key.dptr, key.dsize);
774 tdb_trace_1rec(tdb, "tdb_chainunlock_read", key);
775 return tdb_unlock_list(tdb, h & ((1ULL << tdb->header.v.hash_bits)-1),
779 /* record lock stops delete underneath */
780 int tdb_lock_record(struct tdb_context *tdb, tdb_off_t off)
782 if (tdb->allrecord_lock.count) {
785 return off ? tdb_brlock(tdb, F_RDLCK, off, 1, TDB_LOCK_WAIT) : 0;
789 Write locks override our own fcntl readlocks, so check it here.
790 Note this is meant to be F_SETLK, *not* F_SETLKW, as it's not
791 an error to fail to get the lock here.
793 int tdb_write_lock_record(struct tdb_context *tdb, tdb_off_t off)
795 struct tdb_traverse_lock *i;
796 for (i = &tdb->travlocks; i; i = i->next)
799 if (tdb->allrecord_lock.count) {
800 if (tdb->allrecord_lock.ltype == F_WRLCK) {
805 return tdb_brlock(tdb, F_WRLCK, off, 1, TDB_LOCK_NOWAIT|TDB_LOCK_PROBE);
808 int tdb_write_unlock_record(struct tdb_context *tdb, tdb_off_t off)
810 if (tdb->allrecord_lock.count) {
813 return tdb_brunlock(tdb, F_WRLCK, off, 1);
816 /* fcntl locks don't stack: avoid unlocking someone else's */
817 int tdb_unlock_record(struct tdb_context *tdb, tdb_off_t off)
819 struct tdb_traverse_lock *i;
822 if (tdb->allrecord_lock.count) {
828 for (i = &tdb->travlocks; i; i = i->next)
831 return (count == 1 ? tdb_brunlock(tdb, F_RDLCK, off, 1) : 0);
834 /* The transaction code uses this to remove all locks. */
835 void tdb_release_transaction_locks(struct tdb_context *tdb)
839 if (tdb->allrecord_lock.count != 0) {
840 tdb_off_t hash_size, free_size;
842 hash_size = (1ULL << tdb->header.v.hash_bits)
844 free_size = tdb->header.v.free_zones
845 * (tdb->header.v.free_buckets + 1) * sizeof(tdb_off_t);
847 tdb_brunlock(tdb, tdb->allrecord_lock.ltype,
848 tdb->header.v.hash_off, hash_size);
849 tdb_brunlock(tdb, tdb->allrecord_lock.ltype,
850 tdb->header.v.free_off, free_size);
851 tdb->allrecord_lock.count = 0;
852 tdb->allrecord_lock.ltype = 0;
855 for (i = 0; i<tdb->num_lockrecs; i++) {
856 struct tdb_lock_type *lck = &tdb->lockrecs[i];
858 tdb_brunlock(tdb, lck->ltype, lck->off, 1);
860 tdb->num_lockrecs = 0;
861 SAFE_FREE(tdb->lockrecs);
862 tdb->header_uptodate = false;
866 void tdb_lock_init(struct tdb_context *tdb)
868 tdb->num_lockrecs = 0;
869 tdb->lockrecs = NULL;
870 tdb->allrecord_lock.count = 0;